Portable drafting outfit



F. c. VAN ETTEN. PORTABLE DRAFTING OUTFIT.

APPLICATION FILED NOV. II, 1920.

1,390, 181 l Pmmdsept. 6,1921.,

2 SHEETS-SHEET l.

E. c. VAN ETTEN. PORTABLE DRAETING OUTFIT. APPLICATION FILED NOV- 11,1920.

Patented sept. 6,1921.,

2 SHEETS-SHEET 2.

FFQ.

FRANK C. 'VAN ETTEN, OF CHICAGO, ILLINOIS.

FOI-ETABLE DRAITING OUTFIT.

Specification of Letters Patent.

" Patented Sept. 6, 1921.

Application led November 11, 1920. Serial No. 423,241.

To all who/m, 'it may concern: Y

Be it known that I, FRANK'C. VAN ETTEN, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Portable DraftingOutfits, of which the following is a specification. y

This invention has to do with improvements in portable drafting outts;and has reference to an outfitwhich is especially intended for the useof draftsmen and engi-l neers in the eld. The drafting outfit of thepresent invention is so arranged that the T- s uare may be folded up andwhen foldedy will be of the proper size and shape to con-VV venientlywrap into the foldable paper carrier and table.

One of the objects of the invention is to so Varrange the paper carrierthat the paper will be very effectively protected against the elements,when the carrier is rolled up. Another obj ect of the invention is toprovide an improved form of foldable T-square; and to so arrange andproportion the same with respect to the paper carrier that the foldedT-square may be very conveniently transported with the paper carrieritself.

Other objects and uses of the invention will appear from a detaileddescription of the same which consists in the features `of constructionand combinations of parts hereinafter described and claimed.

1n the drawings:

Figure 1 shows a plan view of the paper carrier unfolded and with theT-square folded up and lying across the paper carrier;

Fig. 2 shows a view similar to that of Fig. 1 with the exception that asheet of paper has been torn oif from the binding edge and set intoplace on the Celluloid strip7 and the 'l'- square has been unfolded andset into working position;

Fig. 3 shows a section taken on the line 8--3 of Fig. 2 looking in thedirection of the arrows;

Fig. 4 shows a side view of the folded T-square; and

Fig. 5 shows a cross sectionof the paper carrier and T-square when theparts are rolled up and out of use. y

The paper carrier comprises a strip of leather 0r other suitable waterproof material 6, the left hand edge 7 of which serves as the bindingedge. To this left hand edge is secured a steel strip or bar 8 by meansof a series of large head screws 9 which are preferably threaded up frombeneath. A number 0f sheets of drafting paper 10 may have their lefthand edges clamped between the strip 6 and the bar 8 as will be clearlyevident particularly from Fig. 8.

Ordinarily a strip of Celluloid or other similar material 11 will beplaced over the pile of drafting sheets 10 and will also have its lefthand edge clamped by the bar 8. When it is desired to use the draftingoutfit, the strip of Celluloid may be turned back, one of the sheets ofpaper may be torn off adjacent to the binding edge, the Celluloid stripmay then be laid down smoothly and the strip of paper may then be set ontop of the Celluloid and secured in place by the use of thumb tacks 12as clearly shown in Fig. 2,

.F rom the foregoing it will be evident that the celluloid strip and thewater proof strip 6 together serve asa weather proof protection for theintervening pile Vof drafting sheets; while at the same time theCelluloid strip andthe drafting sheets below it also serve as aconvenient medium into which the thumb tacks may be forced in order tohold a drafting sheet in place while the outfit is being used in thefield.

l have provided a T-scluare V 13 for use in conjunction with thisoutfit. The said T- square is of such proportion and construction thatit may be folded up into a compact element of substantially the samelength and f width as the binding bar 8,V so that it may be laid againstsaid binding bar and rolled up with the same when the outfit is rolledulp as shown in Fig. 5. This 'xl-square inc udes the central and outermembers 14 and 15 respectively,V which' are hinged together at the point16. An inner end member 17 is secured to the inner end of the section 14but is offset as shown in Figs. 3 and 4. Tf desired, the sections 14 and17 may be formed integral with each other as shown in Fig. 4. The partsare so proportioned that when the upper end member 15 is folded upagainst the member 14 it comes flush with the shoulder 18 adjacent tothe end member 17.

Beneath the end member 17 is pivoted the head 19. This head is ofsubstantially the same width as the members 14, 15 and 17, and ispivoted in such a manner that when the head lies parallel to the bodyportion of the T-square it substantially occupies the space beneath theend member V17 and adj acent to the shoulder 21, the T-square havingsubstantially the same length when'folded to turn the head 19 aroundtothe Vdesired v angle for service as shown in Figs. 2 and '3. At suchtime `there is left a suficient Clearance outside of the shoulder 2l toenable the T-square to be used with convenience.

While I have herein shown and described only a single embodiment of mypresent invention, still I do not limit :myself to the said embodimentexcept as I may do so in the claims. A

I Claim:

l. portable drafting outfit Comprising in Combination a papercarrier-includinga sheet of flexible waterproof backing material, aClamping bar removably secured to one edge thereof and extending thefull dimension of said edge,'a sheet :of Celluloid having one edgebetween said bar and the adjacent edge of the water proof backing.sheet, a plurality of draftingk sheets having their edges between theedge of the sheet ofy Celluloid and said edge .of the water :proofbacking sheet, means for Clampinglthe ibar e and the water proof backingsheet together to thereby retain the edges offthesheet of CelH luloidand of the draftingsheets ini-position, anda foldable `T-square inconjunction with --said ayer .Carrier and com. risinffa Central PN i 1bar, an end bar hinged .to .one end thereof,

an odset member on the inner endl of .the central bar, and having ashoulder adjacent to the position lof the end of the hinged ybar whenfolded, and having another shoulder on its under side, a `head pivotedto the under side of the offset rmember inpositon to Clear vthe undershoulder, .and ofv suitable dimensions to enable said head toseatagainst -the outer edge o f the lClamping bar Vof the paper carrier,said foldable T-square whenV folded having substantially the same lengthand width as said Clamping vbar,iand means for locking the head of theTl-square tosaid offset member, .substantially as described;

2. A portable'drafting outfit Comprising in combination a paper Carrierincluding a sheet of V'liexible wwaterV proof backing material, aClamping bar removably secured to one edge thereoia sheet of Celluloidhaving one edge between said bar and the adjacent edge of the waterproofbacking sheet, a plurality of drafting sheets having their edges Ybetween the edge of the sheet of Celluloid and said edge `of the waterproof backing sheet,means for `Clamping thebar and fthe waterproofbaclringsheet together to thereby retain the edges of the sheet ofCelluloid and of the drafting 1sheets in positiom-and a foldablelf-square in conjunction with said paper Carrier and Comprising acentral bar, an end bar hinged to one end thereof, annifset member onAthe innerend of the Central bar and having a shoulderl adjacent-tol thev 1 width as said Clamping bar, substantially asA described.

v3.- A foldable draftingT-sduarefcomprising in Combination a centralbar, an end bar hingedto oneV end thereof, fan offset memberon the otherendof the Central bar,

and having a shoulder `adjaeentto the posi-V l i:

tion .ofthe .end ,of the hinged barmwhen folded, andhaving anothershouldervv on its underside, ahead pivote/d to the underside of theolfset member `in position to Clear the under shoulder, and means forlocking the head `of theT-square to ,said -offset rnen'ibenV Y wherebythe head of theT-fsquarem`ay be turned into a position parallel to thecentral bar andthe end bar may be folded @over against the Central bar,substantially as ydescribed. 1 ,FRANK C. -VANY Y

